Hat liner



FIG. 1 is a top plan view of a hat liner;

FIG. 2 is a top and side perspective view thereof;

FIG. 3 is an alternative top and side perspective view thereof;

FIG. 4 is a bottom perspective view; and,

FIG. 5 is a bottom and side perspective view thereof.

The broken lines depict claimed perforations in the hat liner. 

CLAIM The ornamental design for a hat liner, as shown and described. 